Metal-filament incandescent lamp.



e. LDECKE.

METAL FILAMENT INGANDESCENT LAMP.

APPLICATION FILED MAB.. 20, 1909.

SP 30 Patented Sept. lf?, 1912.

' im W yi 'Beit known that I, GEORG LoEc-Kn, citi-: y v case of concussion or vibration ofthe lamp,

@one LDECKE,

STATSJATENT orma or AUGSBURG, enamaivrssxeivon 'ro THE rmizroriiioinrmiuv LAM'BENAKTIEN-GESELLSCHAFT, or Auesnvne, GERMANY.

METAL- FILAMENT "rNcaNDEscENT LAMP. i

zen of .Prussia, residing at Augsburg, Bavaria, Germany, have lnvented.v certain new and useful Improvements 1n MetalgItilamen-t'. Incandescent Lamps; and "Indo hereby declare the following to bear `vfull, clear, and exactdescription .of the inventlon,

such as will enable others skilled' in the art kto 4which it appertains to'make and use the Same,

v 'The present invention relates to an im-V provement inthe elastic or sprngy fastening ofthe glass'bridge or stay 1n metallic. filament incandescent lamps, bywhich 1mprovement a considerable simplification and sa-ving'in the cost of production of therlamps V vis effected.

The improvement'consists in the arrange-- ment that the central glass bridgel of the filament carrier is not, as heretofore usual,

' supported at the head'andl foot of the glass bulb by means of small spiral or yother "springs, but isconnected with the foot of the lamp only by a single elastic or springy,

straight Wire, so that the glass bridge is' "still freely suspended and with sufficient elasticity within the glass bulb.

In 4order to prevent the glass bridge swinging too far and coming in contact with the sides of the bulb, whichmight result ina breaking of the filament, a suitable elastic or springy device may advantage'- ously Vbe provided to limit the movement of filament loops 72v or the single straight filaj ments, these latter being connected with the` conductors of the current in the usual manner. A

In Fig. 1 the bridge a is connected wit the glass foot f of the lamp by means of a straight, `springy,.wire e of suitable maferial, said wire e being arranged between theglass bridge and the glass foot of the lamp and having its ends fused into the end 'surfacesof said bridge and foot..

4S'peehaticni if Letter'slatent. Patented Sept-17, 19.11%V Application filed Maroh'Zp, 1809. Serial No. 484,812.. t I 'l In order now to v.be able tov elastically limit the movement ofthe glass bridge :in

the bridge a is provided at its Vend with a .springy metal Wire z' reaching nearly to the apex ofthe lassbulb, asshowninFig.. 2, `YVhex-l'now t e glass bridge swings to the .side,....the wire z' comes in contact with the curved inner lwall of the bulb and the movement of the-.bridge is thus elasticallylimited. v

.A .further advantage of this improved device 1s .tl1at, in consequence of the suppres- 'sion of the lower spiral spring the `lamp can be well fused 4at its apex, and the subsequent entrance of air is thus avoided. p.

- What I claim as my invention and desire to secure by. Letters Patent, is

`1. In an incandescent electric lamp, the

combination of a bulb, a filament-carrying frame, leading-in wires connecting the outside of the bulb with the filament 'upon the frame and an axially rigid, but radially elastic supporting memberinterposed between saidbridge and the stem of the bulb. 2. In an incandescentv electric lamp,the

combination vof a b'ulb, a filament-carrying frame, leading-in lwires connecting the outside of the bulb with the filament upon the frame and an axially rigid, but radially elastic supporting member interposed between said bridge and the stem of the bulb and fused at its ends into the lamp foot and frame respectively.

3. In an incandescent electric lamp, the combination of the bulb, the filament, the glass bridge carry-ing the filament, the leading-in wires connecting the outside of the bulb with the filament carried by the bridge and a vstraight elastic supporting member interposed between said bridge and the stemv ofthe bulb.

4. In aniincan'd'eseent electric lamp, the combination of the bulb, the filament, the bridge forming a carrier for said filament, the leading-in wires passing through the bulb and connectedvwith-the filament upon the bridge and a straight wiry elastic member interposed between the bridge and the bulb and llocated in the axial line of both the bulb and of the filament carrier and forming the sole support forV the said bridge or carrier. r

5.In -an incandescent electric lamp, the combination of the bulb, the filament, the

bridge carrying said filament, the leading-in Wires' passing .through the bulb and connected with the filament, a straight wir flexible su port,- connectn the bridge Wit 5 the lamp. oot and a radia ly elastic projection carried by the bridge and adapted to engage the bulb and to limit the .lateral movement of the bridge.

6. In an incandescent electric lamp, the

'and fuse bridge with the stem of the bulb and fused 15 at its ends into the lamp foot and bridge respeotively and a straight wiry projection extendin from the other end of ,the brid e therein and adapted to engage te bulb to limit the lateral movement of the bridge. v

In testimony whereof I hereunto aiix my signature in the presence of two Witnesses.

GEORG LDECKE.

Witnesses WILH.4 WISSMANN, BERTHOLD MoNAsoH. 

